Hi Altair. Yes indeed, thank you; excuse my rather cack-handed description of the effects of the tilt re ecliptic and zodiac. But I think it does still mean that in particular the northern hemisphere sky from the equator up would have had a markedly different look to today, with as you say the zodiac consisting partly or completely of different constellations. That was my main line of thought regarding its implications when extrapolating the zodiac of today back to the symbols at Gobekli Tepe.Without this 23° tilt the ecliptical plane would be simply coplanar with Earth's equatorial plane so tilt doesn't create ecliptic. It means that zodiac would simply consist partly or completely of different constellations. And due to different visible size of constellations, I can imagine, that in the "pre-tilt" zodiac some (probably the smaller ones) constellations would be "replaced" by others while others (the bigger ones) would "remain" and that zodiac itself would possibly even consist of a bigger or smaller number of constellations.